Funding for this research was provided by:
Text and Data Mining valid from 2019-11-07
Received: 17 May 2019
Accepted: 4 October 2019
First Online: 7 November 2019
Ethics approval and consent to participate
: The study was approved by the Regional Ethical Review Board in Gothenburg (Reg. No. 029–15).
: Patient consent for publication was not required.
: The authors declare that they have no competing interests.